Airbag control unit with part number 77960-SVA-A230-M1

What does the airbag control unit 77960-SVA-A230-M1 do?

The airbag control unit 77960-SVA-A230-M1 is the central control unit of the restraint system (SRS) for Honda. It evaluates the signals from the crash sensors and, in an emergency, decides which airbags and seatbelt pretensioners are triggered. At the same time, it monitors the entire system and reports faults via the airbag warning light.

The decision to trigger is made within fractions of a second, long before the occupants perceive the impact. For this to work, the unit must be ready for operation at all times, which is why it checks the connected components continuously.

After an accident, the control unit stores crash data and then locks itself. The following sections describe what happens next.

Why does the control unit 77960-SVA-A230-M1 fail?

The most common cause with the 77960-SVA-A230-M1 is crash data that remains stored after an accident, even if no airbag has triggered. A standard diagnostic tool cannot erase it. Ageing components, cold solder joints, moisture and corrosion at plug connections, and voltage spikes are also possible causes.

It is particularly unsettling with crash data that the vehicle may show no visible damage. The data sits in the memory of the unit and cannot be removed with common tools. Airbag24 erases it as part of the repair.

The other causes relate to the service life of the electronics. Components age, solder joints on the circuit board can go cold, and moisture attacks the contacts. Voltage spikes arise, for example, with a weak battery or when connecting to jump leads.

How can you tell that the 77960-SVA-A230-M1 is defective?

A fault in the 77960-SVA-A230-M1 first shows through the airbag warning light in the instrument cluster, which stays on permanently or intermittently. Also present may be an error message in the instrument cluster, a missing connection to the diagnostic tool, or a fault memory that cannot be cleared.

In an emergency, airbags and seatbelt pretensioners may then possibly not trigger. That is why the warning light must be taken seriously, even if the vehicle otherwise drives without any noticeable problems.

The warning light is therefore the first warning sign the vehicle itself gives. Pay particular attention to the following signs:

• Airbag warning light in the instrument cluster, permanently or intermittently
• Error message in the instrument cluster
• Diagnostic tool receives no connection to the control unit
• Fault memory cannot be cleared

Which vehicles is the 77960-SVA-A230-M1 fitted in?

The control unit 77960-SVA-A230-M1 is fitted in these vehicles: Honda Civic 8th generation (2005-2011).

The following list shows the vehicles assigned to this part number.

• Honda Civic 8th generation (2005-2011)

First, compare the part number on the label of the removed unit with this page. This only ensures that you have the correct unit in front of you. Also have the fault memory read out beforehand, because only this result shows whether the control unit is faulty or whether a plug or cable is the cause.

For the same vehicles, we also repair control units with the part numbers 77960-S02-A840-M3, 77960-SMG-G014-M1.

How does the repair of the 77960-SVA-A230-M1 work?

First, you have the fault memory read out and add the log. Then you disconnect the battery and only then remove the control unit 77960-SVA-A230-M1. Processing at Airbag24 normally takes 3–4 working days.

Next, you create a repair order online and send the unit well packed. Airbag24 checks it on the test bench, repairs defective components, erases the stored crash data and carries out a function test. After that, your own unit goes back to you.

Testing, repair and the function test at Airbag24 run during this time, independent of the steps before dispatch. Our repairs come with 2 years' statutory liability for defects. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.

How does the control unit 77960-SVA-A230-M1 get to Airbag24?

You send the control unit 77960-SVA-A230-M1 in as a parcel, or you book a UPS collection for an extra charge. After the repair, Airbag24 returns it by UPS.

Put the printed repair order into the parcel and pack the unit shock-resistant before it goes on its way.